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If people use quartz as a medium of exchange,then they:
Species
A category in the classification of organisms, referring to a group that can reproduce amongst itself and produce fertile offspring.
Bipedality
The ability to walk upright on two legs, a key feature distinguishing humans and some other species from quadrupedal animals.
Selective Pressures
The environmental factors that favor certain phenotypes over others, influencing an organism's ability to survive and reproduce.
Human Lineage
The evolutionary path leading to and including Homo sapiens, marked by significant milestones such as bipedalism and complex tool use.
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